The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
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What Is 86.1 Kg In Stone And What's Your BMI?
86.1 kg converts to approximately 13 stone 8 pounds in UK measurements. However, whether this weight is healthy for you depends entirely on your height — the same weight gives very different BMI results at different heights. Your BMI is one of the most useful ways to understand if your weight falls within a healthy range according to NHS guidelines. Use our free BMI calculator above to find your personal BMI instantly, or read on to see how 86.1 kg translates to stone and what BMI this weight gives at common UK heights.
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Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
86.1 Kg In Stone At Different Heights — BMI Examples
To convert 86.1 kilograms to stone, divide by 6.35029: 86.1 kg ÷ 6.35029 = 13 stone 8 pounds (13st 8lbs). However, BMI depends on height, so the same weight gives different health contexts depending on how tall you are. Here's how 86.1 kg translates to BMI at common UK heights:
- At 160 cm (5ft 3in): BMI 33.6 (Obese Class I)
- At 165 cm (5ft 5in): BMI 31.6 (Obese Class I)
- At 170 cm (5ft 7in): BMI 29.8 (Overweight)
- At 175 cm (5ft 9in): BMI 28.1 (Overweight)
- At 180 cm (5ft 11in): BMI 26.6 (Overweight)
- At 185 cm (6ft 1in): BMI 25.2 (Healthy weight)
These examples show why height matters so much when using weight converters and assessing health — the same weight in kilograms to stone can represent anything from obesity to a healthy weight depending on your height.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Understanding NHS Weight Categories And BMI Limitations
NHS BMI categories are: below 18.5 (underweight), 18.5–24.9 (healthy weight), 25.0–29.9 (overweight), 30.0–34.9 (obese Class I), 35.0–39.9 (obese Class II), and 40.0+ (severely obese). For adults of South Asian, Chinese, Black African, or Black Caribbean heritage, the NHS recommends lower thresholds — consult your GP about what's healthy for you. Important: BMI does not distinguish between muscle and fat, so athletes or very muscular individuals may have a higher BMI despite low body fat. Waist circumference is also important — men with waist over 102 cm (40 inches) and women over 88 cm (34.5 inches) face increased health risks. Use our weight converter above to check other weights, and speak to your GP about your personal health context.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
What is 86.1 kg in stone and pounds?
86.1 kg converts to 13 stone 8 pounds (13st 8lbs) using the standard kilogram to stone conversion. To calculate: 86.1 kg ÷ 6.35029 = 13.53 stone. Multiply the decimal (0.53) by 14 to get pounds: 0.53 × 14 = approximately 7.4 pounds, giving 13st 7.4lbs.
Is 86.1 kg a healthy weight?
Whether 86.1 kg is healthy depends entirely on your height. At 170 cm (5ft 7in) it gives BMI 29.8 (overweight), but at 185 cm (6ft 1in) it gives BMI 25.2 (healthy weight). Use our free BMI calculator on this page with your actual height to see where you fall on NHS weight categories.
What's the healthy weight range for my height if I weigh 86.1 kg?
Your healthy BMI range is 18.5–24.9 according to NHS guidelines. Calculate your healthy weight range by multiplying: (18.5 × height in metres squared) to (24.9 × height in metres squared). For example, at 175 cm (5ft 9in), healthy weight is approximately 56.7–75.8 kg (8st 13lbs–11st 12lbs).
How do I convert kilograms to stone accurately?
Divide kilograms by 6.35029 to get stone. The decimal part × 14 gives you pounds. So 86.1 kg: 86.1 ÷ 6.35029 = 13.53 stone; 0.53 × 14 = 7.4 pounds. Try our free weight converter above for instant conversions between kg, stone, and pounds.
Should I lose weight if I'm 86.1 kg?
This depends on your height, age, muscle mass, and overall health. Speak to your GP who can assess your personal situation. If your BMI is in the overweight or obese range, even a 5–clinically studied weight loss can bring meaningful health benefits. Our GLP-1 weight loss calculator can help you explore weight loss options.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.